Rendering specification in case map's tile size does not match tileset's tile size

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**Is your feature request related to a problem? Please describe.**

I have been writing a renderer for TMX maps, and I have a staggered map that has a tileset that does not have the same tile size as the map's tile size in the XML. In this case, I don't really known what to do. I have been patching my code in various ways but I have never been satisfied with the patches. They have to work for all the layouts, not just staggered. If necessary, I can provide a simple example.

**Describe the solution you'd like**

Is it possible to specify the expected behaviour in case map's tile size does not match tileset's tile size for all the layouts?

**Describe alternatives you've considered**

I have tried to understand the code in Tiled, but I did not managed to find the lines where this is handled.

Start by investigating how Tiled handles map and tileset tile sizes across the different map layouts, since the issue does not identify specific files, tests, or entry points. Review the TMX representation and existing rendering behavior; done means the expected behavior is clearly specified for mismatched sizes in all layouts.

Written by the indexing model from the issue text.